Levi gris



@britte .gratins itrtrnt @frn LEVI GRTSWOLD, OF PORTLAND, AND G. OAUL, OF YORK, WISCONSIN.

Letters Patent No. 67,043, dated July 23, 1867.

IMPROVEMENT IN GUT-OFF VALVES.

TO ALL WHOM IT MAY CONCERN:

Be it known that we, L. GRISWOLD, of Portland, in the county of Dodge, and State of Wisconsin, and CAL, of York, in the county of Dane, and State of Wisconsin, have invented a new and improved Steam Cut-Off; and we do hereby declare that the following is a full, clear, and exact description thereof, which will enable others skilled in the art to make and use the sume, reference being had to the accompanying drawings, forming part of this specification. I

This invention relates to the manner in which the steam is admitted to the working cylinder, and to the manner in which it is controlledvand exhausted; and it consists in providing.)r a steam-chest with cylinders and pistons (or valves) and apertures, and arranging them in such a manner thaty the valves or pistons'which admit and out ott' the steam shall not be subject to undue friction, in consequence of the pressure of the stenm; and also so that the steam is made to operate upon the'main shaft when the crank is in the centre, as will -be heroinafter more fully described.

Figure 1 represents a vertical longitudinal section of our arrangement through the line :vz of iig. 2, showing the course of the steam by arrows.

Figure 2 is a section ot` 5g. 1 through the line 1/ y.

FigureB is a. detailed view of the lower cyilinder, showing a. top View oi" it in section through the linez z ot; iig. 1.

Figure'4 shows the upper cylinder detached, it being also atop view in section through the line e e of tig. 1.

Similar letters of reference indicate like parts.

A represents the ste-.1m or induction pipe. B is the steam-chest proper. C is a cylinder in B, with rod and pistons or valves. This rod is marked D, and it is operated'or moved by liand. E represents another cylinder, under O, which also has a rod and piston-valves on it, and which is also moved by hand when it is desired to change its position. F represents another cylinder, under E, also with rod and piston-valves attached. vAnother view of this'cylinder is shown in fig. 3. Between this cylinder F and the upper cylinder C there is an outside pipe communication, marked-f, seen in dotted lines in g. 1, standing at` an angle o'n the steamchest, which shows the course of the exhaust steam. The piston-valves in the lower cylinder F are operated 'by the rod, through a connection with the crank from the engine. These valves, covering the steam-ports,

are plainly shown in fig. 3. The steam from the cylinder is exhausted in this cylinder F between the pistonvalves, from whence it is conduct-ed through the pipe finto the upper cylinder C, from whence it passes in the exhaust pipe marked G, and is discharged. a a represent the steam-ports leading to the engine cylinder. When the crank of the engine is standing on a dead-centre the piston-valve rod in E is drawn out or pushed in by hand, in order to throw the force of the steam upon either of the valves in F. The rod D in the upper cylinder, `through the piston-valves on it, is moved by hand when it is desired to open or close either of the ports or apertures through that cylinder. It will be noticed that the lower or cut-oii` valves in the cylinder F, which are ope-rated by the engine, are balanced by the pressr e of steam, and work with very little friction.

Having thus described our invention, what we claim as new, and desire to secure by Letters Patent, is-

1. The cylinders O, E, and F, with the piston-valves and rods, constructed and arranged substantially as described, for the purposes set forth.

2. In combination with the above, we claim the pipe f, as herein set forth, for the purpose specified.

LEVI GRISWOLD, G. CAUL.

Witnesses:

HARVEY RowELL, HENRY D. Lumens. 

